. >> the romneys had left the united states and went to mexico to avoid persecution, but it's also to pursue polygamy. >> narrator: miles romney had five wives and 30 children. >> they built a ranch and he's back in stone age conditions with no money. romney's father is now on the scene. that gets destroyed by guerrillas. they move back to california, poverty again. they build it back up. they move back to salt lake city. they build it back up. romney's whole history of a family is that they knocked us down, we built it back up. we didn't make a fortune; we made a bunch of fortunes. and they resented us for our success, but we kept coming back. that's romney's history. >> with someone with a name with romney you heard about the sufferings of your ancestors and their sacrifices and all they've done that you feel like, well, it's my turn now; i've got to pick up the baton and run with it. >> narrator: but mitt and his family rarely tell the story to outsiders. >> it's an incredible history. he can't talk about it because it involves polygamy. and so if the core of your personality is so